Rotary compressors and refrigeration systems

Abstract

To suppress uneven distribution of a liquid cooling medium flowing into each compression section from an accumulator in a rotary compressor equipped with a plurality of compression sections.SOLUTION: An outlet pipe (73) of an accumulator (70) is provided with a connection part (80) connected to a suction pipe (40). The connection part (80) includes a main flow passage (81) extending downward, a plurality of branch flow passages (83,84) in which the inflow port (85) thereof communicates with the main flow passage (81), and the outflow port (86) thereof communicates with the suction pipe (40), and a branch part (87) formed below the main flow passage (81) with which a liquid cooling medium passing through the main flow passage (81) collides, and which causes the liquid cooling medium to diverge to each of the branch flow passages (83,84).SELECTED DRAWING: Figure 3

Description

Technical Field

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[0001] The present disclosure relates to a rotary compressor and a refrigeration device.

Background Art

[0002] Patent Document 1 describes a rotary compressor having two compression parts. An accumulator is disposed adjacent to this rotary compressor. The accumulator has an outlet pipe whose end branches into two. Each of the branched ends of the outlet pipe is connected to each compression part via a suction pipe. Gas refrigerant and liquid refrigerant are sent into each compression part from the accumulator through the outlet pipe and the suction pipe.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Each of the branched ends of the outlet pipe described in Patent Document 1 is formed side by side in the vertical direction. Therefore, the liquid refrigerant passing through the outlet pipe flows more into the lower branched end than the upper branched end due to gravity, and there is a bias in the amount of liquid refrigerant flowing into each compression part. When such a bias occurs in the inflow amount of the liquid refrigerant, in the lower compression part into which a large amount of liquid refrigerant flows, the liquid refrigerant may be compressed, and the rotary compressor may malfunction.

[0005] An object of the present disclosure is to suppress the uneven distribution of the liquid refrigerant flowing from the accumulator into each compression part in a rotary compressor having a plurality of compression parts.

Means for Solving the Problems

[0006] The first embodiment comprises a casing (11), a plurality of compression sections (50a, 50b) housed in the casing (11) for compressing refrigerant drawn in from a suction pipe (40), and an accumulator (70) for separating the refrigerant drawn into the compression sections (50a, 50b) into gas and liquid, wherein the accumulator (70) has one outlet pipe (73) in which a liquid return hole (75) is formed for returning liquid refrigerant to the casing (11), and the outlet pipe (73) has a connection section for connecting the outlet pipe (73) to the suction pipe (40) A rotary compressor is provided with a connection section (80), the connection section (80) having a main flow path (81) into which the refrigerant flowing out from the accumulator (70) flows and which extends downward, a plurality of branch flow paths (83, 84) whose inlets (85) communicate with the main flow path (81) and whose outlets (86) communicate with the suction pipe (40), and a branch section (87) formed below the main flow path (81) which collides with the liquid refrigerant that has passed through the main flow path (81) and divides the liquid refrigerant into each of the branch flow paths (83, 84).

[0007] In the first embodiment, the connection section (80) has a branch section (87) formed below the main flow path (81). As a result, the liquid refrigerant that has passed through the main flow path (81) collides with the branch section (87) and is evenly distributed to each branch flow path (83, 84). Consequently, uneven distribution of the liquid refrigerant flowing from the accumulator into each compression section (50a, 50b) can be suppressed.

[0008] In the second embodiment, the inlets (85, 85) of the diversion channels (83, 84) are aligned horizontally.

[0009] In the second embodiment, the inlets (85, 85) of the branch channels (83, 84) are aligned horizontally, allowing the liquid refrigerant that has passed through the main channel (81) to be evenly distributed to each branch channel (83, 84).

[0010] In the third embodiment, in the second embodiment, the inlets (85, 85) of the diversion channels (83, 84) face upward.

[0011] In the third embodiment, the inlets (85, 85) of the branch channels (83, 84) face upward, making it easier for the liquid refrigerant that has passed through the main channel (81) to flow into each branch channel (83, 84).

[0012] In the fourth embodiment, in any one of the first to third embodiments, the inlets (85, 85) of the branch channels (83, 84) are arranged on either side of the axis (C) of the main channel (81).

[0013] In the fourth embodiment, the inlets (85, 85) of the branch channels (83, 84) are arranged on either side of the axis (C) of the main channel (81), thereby allowing the liquid refrigerant that has passed through the main channel (81) to be evenly distributed to each branch channel (83, 84).

[0014] In the fifth embodiment, in any one of the first to fourth embodiments, the connecting portion (80) is formed integrally with the outlet pipe (73).

[0015] In the fifth embodiment, the number of components constituting the rotary compressor (10) can be reduced by forming the connection portion (80) integrally with the outlet pipe (73). This reduces the cost of the rotary compressor (10).

[0016] The sixth embodiment is one of the first to fourth embodiments in which the connecting portion (80) is made of a separate component from the outlet pipe (73).

[0017] In the sixth embodiment, by constructing the connecting part (80) from a separate component from the outlet pipe (73), the connecting part (80) and the outlet pipe (73) can be made of different materials. This allows for the use of less expensive materials for both the connecting part (80) and the outlet pipe (73), thereby reducing the cost of the rotary compressor (10).

[0018] The seventh embodiment is a refrigeration system comprising a rotary compressor (10) according to any one of the first to sixth embodiments, and a refrigerant circuit (1a) through which the refrigerant compressed by the rotary compressor (10) flows.

[0019] In the seventh aspect, since the rotary compressor (10) can suppress the uneven distribution of the liquid refrigerant flowing from the accumulator (70) into each compression part (50a, 50b), a refrigeration device that is less likely to fail can be provided.

Brief Description of the Drawings

[0020] [Figure 1] FIG. 1 is a schematic piping system diagram of a refrigeration device according to an embodiment. [Figure 2] FIG. 2 is a longitudinal sectional view showing the configuration of the rotary compressor. [Figure 3] FIG. 3 is a longitudinal sectional view showing an enlarged periphery of the connection part of the outlet pipe. [Figure 4] FIG. 4 is a sectional view taken along the arrow IV-IV line in FIG. 3. [Figure 5] FIG. 5 is a diagram corresponding to FIG. 3 of Modification 2. [Figure 6] FIG. 6 is a diagram corresponding to FIG. 3 of the reference example.

Modes for Carrying Out the Invention

[0021] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Note that the present disclosure is not limited to the embodiments shown below, and various changes can be made without departing from the technical idea of the present disclosure. Since each drawing is for conceptually explaining the present disclosure, the dimensions, ratios, or numbers may be exaggerated or simplified as necessary for easy understanding.

[0022] 《Embodiment》 (1) Outline of the Refrigeration Device As shown in FIG. 1, the rotary compressor (10) is provided in the refrigeration device (1). The refrigeration device (1) has a refrigerant circuit (1a) filled with a refrigerant. The refrigerant circuit (1a) includes a rotary compressor (10), a radiator (3), a decompression mechanism (4), and an evaporator (5). The decompression mechanism (4) is an expansion valve. The refrigerant circuit (1a) performs a vapor compression refrigeration cycle.

[0023] In the refrigeration cycle, the refrigerant compressed by the rotary compressor (10) releases heat into the air in the heat exchanger (3). The refrigerant that has released heat is depressurized by the depressurization mechanism (4) and evaporates in the evaporator (5). The evaporated refrigerant is drawn back into the rotary compressor (10).

[0024] The refrigeration system (1) is an air conditioning system. The air conditioning system may be a cooling-only unit, a heating-only unit, or an air conditioning system that switches between cooling and heating. In this case, the air conditioning system has a switching mechanism (e.g., a four-way switching valve) that switches the direction of refrigerant circulation. The refrigeration system (1) may also be a water heater, a chiller unit, a cooling system that cools the air inside a storage unit, etc. The cooling system cools the air inside a refrigerator, freezer, container, etc.

[0025] (2) Rotary compressor The rotary compressor (10) compresses the inhaled low-pressure gaseous refrigerant and discharges the high-pressure gaseous refrigerant. As shown in Figure 2, the rotary compressor (10) in this embodiment is a two-cylinder rotary compressor (10). The rotary compressor (10) comprises a casing (11), a drive mechanism (20), a compression mechanism (50), and an accumulator (70).

[0026] (2-1) Casing The casing (11) is composed of a vertically elongated cylindrical sealed container. The casing (11) has a body (12), a lower end plate (13), and an upper end plate (14). The body (12) is configured as a cylinder extending in the vertical direction (axial direction). The body (12) is open at both ends in the vertical direction. The lower end plate (13) is fixed to the lower end of the body (12). The upper end plate (14) is fixed to the upper end of the body (12).

[0027] A suction pipe (40) is fixed through the lower part of the body (12). A discharge pipe (16) is fixed through the upper end plate (14).

[0028] A reservoir (18) is formed at the bottom of the casing (11). The reservoir (18) stores oil (refrigeration oil) for lubricating the sliding parts of the compression mechanism (50) and the drive shaft (30), which will be described later. The reservoir (18) is composed of the lower end plate (13) and the lower inner wall of the body (12).

[0029] (2-2) Drive mechanism The drive mechanism (20) is housed within the casing (11). The drive mechanism (20) drives the compression mechanism (50). The drive mechanism (20) includes an electric motor (21) and a drive shaft (30).

[0030] The electric motor (21) is located at the top of the casing (11). The electric motor (21) is located above the compression mechanism (50). When the electric motor (21) is energized, the drive shaft (30) is rotated.

[0031] The drive shaft (30) is connected to the electric motor (21) and the compression mechanism (50) of The components are connected. The drive shaft (30) is located on the axis of the body (12) of the casing (11). An oil supply pump (30a) is attached to the lower end of the drive shaft (30). The oil supply pump (30a) transports the oil stored in the reservoir (18). The transported oil is supplied to the compression mechanism (50) and the sliding parts of the drive shaft (30) through the oil passage (30b) inside the drive shaft (30).

[0032] The drive shaft (30) has one main shaft portion (31) and two eccentric portions (32, 32). The upper part of the main shaft portion (31) is fixed to the electric motor (21). Each eccentric portion (32, 32) is a cylindrical portion with a larger diameter than the main shaft portion (31). Each eccentric portion (32, 32) is eccentric from the rotation center of the main shaft portion (31). The axis of each eccentric portion (32, 32) is eccentric by a predetermined amount from the axis of the main shaft portion (31). The eccentricity direction of the front (upper) eccentric portion (32) with respect to the axis of the main shaft portion (31) is 180° different from the eccentricity direction of the rear (lower) eccentric portion (32) with respect to the axis of the main shaft portion (31).

[0033] The main shaft portion (31) of the drive shaft (30) above the front eccentric portion (32) is located inside the front through-hole (52c) of the front head (52), which will be described later, and is rotatably supported. The main shaft portion (31) of the drive shaft (30) below the rear eccentric portion (32) is located inside the rear through-hole (53c) of the rear head (53), which will be described later, and is rotatably supported.

[0034] (2-3) Compression mechanism The compression mechanism (50) is housed within the casing (11). The compression mechanism (50) is positioned below the electric motor (21). The compression mechanism (50) includes a plurality of compression sections (50a, 50b). The compression mechanism (50) of this embodiment has one front head (52), one rear head (53), one intermediate plate (58), and two compression sections (50a, 50b). Each compression section (50a, 50b) has one cylinder (51) and one piston (60). The two compression sections (50a, 50b) are spaced apart in the vertical direction (axial direction). The two compression sections (50a, 50b) consist of a first compression section (50a) on the front side (upper side) and a second compression section (50b) on the rear side (lower side).

[0035] The compression mechanism (50) is arranged from top to bottom with the front head (52), front cylinder (51), intermediate plate (58), rear cylinder (51), and rear head (53) overlapping. The front cylinder (51), rear cylinder (51), front head (52), rear head (53), and intermediate plate (58) are integrated via fastening members (not shown).

[0036] Each cylinder (51, 51) is a cylindrical member that covers the outer circumference of the eccentric portion (32, 32). Each cylinder (51, 51) is fixed to the lower inner surface of the body portion (12) of the casing (11). Each cylinder (51, 51) is formed in a flattened, roughly annular shape.

[0037] A circular compression chamber (55) is formed in the center of each cylinder (51, 51). Each cylinder (51, 51) has a radially extending intake port (56). The outlet end of each intake port (56, 56) communicates with the corresponding compression chamber (55). An intake pipe (40) is connected to the inlet end of each intake port (56, 56). In the compression chamber (55) of each compression section (50a, 50b), the refrigerant drawn in from the intake pipe (40) is compressed.

[0038] The front head (52) is stacked on the upper end of the front cylinder (51). The front head (52) is positioned to cover the internal space of the front cylinder (51) from above. A front through-hole (52c) is formed in the center of the front head (52), penetrating vertically. A discharge passage (not shown) for discharging the gaseous refrigerant compressed in the compression chamber (55) is formed in the front head (52). The discharge passage penetrates the flat annular portion of the front head (52) that is stacked on the cylinder (51) in the vertical direction (axial direction).

[0039] The rear head (53) is stacked on the lower end of the rear cylinder (51). The rear head (53) is positioned to cover the internal space of the rear cylinder (51) from below. A rear through-hole (53c) is formed in the center of the rear head (53), penetrating in the vertical direction (axial direction).

[0040] The intermediate plate (58) is positioned between the front and rear cylinders (51). The intermediate plate (58) covers the internal space of the front cylinder (51) from below and the internal space of the rear cylinder (51) from above. The intermediate plate (58) is a circular, flat plate-shaped member. A through hole is formed in the center of the intermediate plate (58), penetrating it in the thickness direction. The drive shaft (30) is inserted through the through hole.

[0041] Each piston (60,60) is housed inside the front and rear cylinders (51,51), respectively. The cylinder (51) and piston (60) form a compression chamber (55). Each piston (60,60) is formed in a circular annular shape. A corresponding eccentric part (32) is fitted inside each piston (60,60). The inside of the compression chamber (55) is divided into a low-pressure chamber and a high-pressure chamber by a blade (not shown). The compression mechanism (50) of this embodiment is a so-called oscillating piston type compression mechanism (50).

[0042] (2-4) Suction pipe The suction pipe (40) communicates with the suction port (56) of each cylinder (51, 51) and is located inside the corresponding joint pipe (19). The rotary compressor (10) of this embodiment has two suction pipes (40, 40) and two joint pipes (19, 19).

[0043] Each connecting pipe (19,19) is a cylindrical member. One end of each connecting pipe (19,19) is inserted through and fixed into a through hole (15) formed in the body (12) of the casing (11). Each through hole (15,15) of the casing (11) is formed in a position opposite to the corresponding intake port (56). Each connecting pipe (19,19) extends from the body (12) of the casing (11) toward the accumulator (70).

[0044] Each suction tube (40,40) extends outside the casing (11) through the inside of the corresponding fitting tube (19). Each suction tube (40,40) connects the suction port (56) of the corresponding compression section (50a,50b) to the outlet tube (73) of the accumulator (70), which will be described later. Each suction tube (40,40) consists of a suction tube body (41) and a connecting tube section (42).

[0045] The suction tube body (41) is a straight, cylindrical member. The outlet end of the suction tube body (41) is connected to the suction port (56) of the corresponding compression section (50a, 50b). The inlet end of the suction tube body (41) is connected to the outlet end of the connecting tube section (42).

[0046] The connecting pipe section (42) is a cylindrical member. The inlet end of the connecting pipe section (42) is connected to the lower end of the outlet pipe (73). The upper connecting pipe section (42) is bent from the lower end of the outlet pipe (73) toward the suction pipe body (41). The lower connecting pipe section (42) extends downward from the lower end of the outlet pipe (73) and then bends toward the suction pipe body (41). The suction pipe (40) may be formed with the suction pipe body (41) and the connecting pipe section (42) as one integral part.

[0047] (2-5) Accumulator The accumulator (70) is positioned adjacent to the side of the casing (11). The accumulator (70) is located upstream of the compression mechanism (50). The accumulator (70) temporarily stores the refrigerant before it is drawn into the compression mechanism (50) and separates the liquid refrigerant contained in the gaseous refrigerant into gas and liquid. The accumulator (70) has one sealed container (71), one inlet pipe (72), and one outlet pipe (73).

[0048] The sealed container (71) is composed of a vertically elongated cylindrical member. Inside the sealed container (71), a gas storage section (71a) and a liquid storage section (71b) are formed. The gas storage section (71a) is located in the upper part of the internal space of the sealed container (71). The liquid storage section (71b) is located in the lower part or bottom of the internal space of the sealed container (71). The gas storage section (71a) stores the gas refrigerant separated within the sealed container (71). The liquid storage section (71b) stores the liquid refrigerant separated within the sealed container (71). In addition to the liquid refrigerant, the liquid storage section (71b) may also store refrigerant oil that has flowed into the sealed container (71).

[0049] The inlet pipe (72) penetrates the top of the sealed container (71). The inlet pipe (72) allows the refrigerant that has passed through the evaporator (5) to flow into the sealed container (71). The lower end of the inlet pipe (72) opens towards the upper part of the internal space of the sealed container (71).

[0050] The outlet pipe (73) penetrates the bottom of the sealed container (71). The outlet pipe (73) allows the refrigerant to flow out of the sealed container (71). The outlet pipe (73) is made of copper. The outlet pipe (73) has a main body (74) and a connecting part (80).

[0051] The main body (74) is a tubular portion that extends straight upward inside the sealed container (71). The upper end of the main body (74) opens towards the upper part of the internal space of the sealed container (71). The upper end of the main body (74) communicates with the gas storage section (71a). The axis of the main body (74) roughly coincides with the axis of the sealed container (71). The lower end of the main body (74) is located at roughly the same height as the lower end of the sealed container (71).

[0052] A liquid return hole (75) is formed at the bottom of the main body (74). The liquid return hole (75) is a hole for returning the liquid refrigerant, which has been separated in the sealed container (71), back to the casing (11). The liquid return hole (75) communicates with the liquid storage section (71b). The liquid refrigerant from the liquid storage section (71b) flows through the liquid return hole (75). The diameter of the liquid return hole (75) is very small compared to the inner diameter of the main body (74). Inside the main body (74), gaseous refrigerant stored in the gas storage section (71a) and liquid refrigerant stored in the liquid storage section (71b) flow.

[0053] The connecting portion (80) is a cylindrical part located at the bottom of the outlet pipe (73). The connecting portion (80) is provided continuously below the main body portion (74). The connecting portion (80) is formed integrally with the main body portion (74). The outer diameter of the connecting portion (80) is larger than the outer diameter of the main body portion (74).

[0054] As shown in Figure 3, a refrigerant flow path is formed inside the connection part (80). The refrigerant flow path of the connection part (80) has a main flow path (81) and a number of (two in this embodiment) branch flow paths (83, 84). In this embodiment, the refrigerant flow path of the connection part (80) is formed in an inverted Y shape.

[0055] The main flow path (81) is formed at the top of the connection section (80). The main flow path (81) extends downward inside the connection section (80). In this embodiment, the main flow path (81) extends generally in a vertical direction. The cross-section of the main flow path (81) is formed in a circular shape. The diameter of the inlet of the main flow path (81) is the same as the diameter of the inlet of the main body section (74). The diameter of the outlet of the main flow path (81) is larger than the diameter of the inlet of the main flow path (81). In other words, the diameter of the main flow path (81) increases as it extends downward. The inlet end of the main flow path (81) is connected to the outlet end of the main body section (74). Gaseous refrigerant and liquid refrigerant that have flowed out of the sealed container (71) flow into the main flow path (81).

[0056] Each branch channel (83, 84) is a channel that branches off from the main channel (81). Each branch channel (83, 84) is formed at the bottom of the connection section (80). Each branch channel (83, 84) extends straight downward inside the connection section (80). Each branch channel (83, 84) extends generally in a vertical direction. The cross-section of each branch channel (83, 84) is formed in a circular shape. The diameter of each branch channel (83, 84) is constant. The diameter of each branch channel (83, 84) is smaller than the diameter of the inlet end (upper end) of the main channel (81).

[0057] The two branch channels (83, 84) consist of a first branch channel (83) and a second branch channel (84). The first branch channel (83) is located closer to the casing (11). The second branch channel (84) is further away from the casing (11) than the first branch channel (83). The inlets (85, 85) of each branch channel (83, 84) are connected to the outlet end of the main channel (81) and communicate with the main channel (81). The outlets (86, 86) of each branch channel (83, 84) are connected to the inlet end of the connecting pipe section (42) in the suction pipe (40) and communicate with the suction pipe (40). Specifically, the outlet (86) of the first branch channel (83) is connected to the inlet end of the upper connecting pipe section (42). The outlet (86) of the second branch channel (84) is connected to the inlet end of the lower connecting pipe section (42).

[0058] As shown in Figures 3 and 4, the inlets (85, 85) of each branch channel (83, 84) are aligned horizontally. In this embodiment, the inlets (85, 85) of each branch channel (83, 84) are aligned horizontally, which allows the liquid refrigerant that has passed through the main channel (81) to be distributed to each branch channel (83, 84) almost evenly without being biased towards any one of them.

[0059] The inlets (85, 85) of each branch channel (83, 84) face upwards. This makes it easier for the liquid refrigerant that has passed through the main channel (81) to flow into each branch channel (83, 84).

[0060] As shown in Figure 4, the inlets (85, 85) of each branch channel (83, 84) are located on both the left and right sides of the axis (C) of the main channel (81). In this embodiment, the inlets (85, 85) of the first branch channel (83) and the second branch channel (84) are located opposite each other, with the axis (C) of the main channel (81) in between. In other words, the axes (C1, C2) of each branch channel (83, 84) and the axis (C) of the main channel (81) are aligned in a straight line. Here, let L1 be the distance between the axis (C) of the main channel (81) and the axis (C1) of the first branch channel (83), and let L2 be the distance between the axis (C) of the main channel (81) and the axis (C2) of the second branch channel (84). In this embodiment, distances L1 and L2 are equal.

[0061] The connection section (80) has one branch section (87). As shown in Figure 4, the branch section (87) is formed between the inlets (85, 85) of each branch channel (83, 84) inside the connection section (80). As shown in Figure 3, the branch section (87) is formed directly below the main channel (81). The branch section (87) causes the liquid refrigerant that has passed through the main channel (81) to fall and collide with the branch section (87), thereby distributing the liquid refrigerant to each of the branch channels (83, 84). In this embodiment, the branch section (87) is formed in a concave shape with a central part that is recessed downwards. The center of the branch section (87) coincides with the axis of the main channel (81). In this way, because the connection section (80) has a branch section (87), the liquid refrigerant that has passed through the main channel (81) can collide with the branch section (87) and be distributed to each of the branch channels (83, 84) in a generally even manner.

[0062] As shown in Figure 3, when the outlet pipe (73) is viewed from the front, the liquid return hole (75) is formed on a virtual straight line A that passes through the midpoints of the axes (C1, C2) of the first branch channel (83) and the second branch channel (84). In other words, the liquid return hole (75) is formed at a position where the distance between the liquid return hole (75) and each branch channel (83, 84) is equal. Therefore, the liquid refrigerant flowing in from the liquid return hole (75) flows into each branch channel (83, 84) almost evenly without being biased towards either channel. In this embodiment, the virtual straight line A roughly coincides with the axis of the main channel (81).

[0063] In this configuration, if a large amount of liquid refrigerant flows into one of the multiple branch channels, causing an imbalance in the amount of liquid refrigerant flowing, the proportion of gaseous refrigerant flowing through the branch channel with a larger liquid refrigerant flow rate will be smaller than that of the other branch channels. As a result, the gaseous refrigerant flow rate will be faster in the branch channel with a larger liquid refrigerant flow rate compared to the other branch channels, leading to a larger pressure loss in the branch channel. In the configuration of the connection section (80) of this embodiment, the amount of liquid refrigerant flowing into each branch channel (83, 84) can be made roughly equal, so the gaseous refrigerant flow rate in each branch channel (83, 84) can be made roughly equal. This makes it possible to suppress the increase in pressure loss in a specific branch channel (83, 84).

[0064] Furthermore, since the outlet pipe (73) of this embodiment has a connection part (80), even when connecting the accumulator (70) to a compression mechanism (50) having multiple compression parts (50a, 50b), it is not necessary to use multiple outlet pipes. Therefore, the cost of the accumulator (70) can be reduced, and the cost of the rotary compressor (10) can be reduced.

[0065] (3) Operation of the rotary compressor Each piston (60,60) rotates eccentrically within its corresponding compression chamber (55,55) as the drive shaft (30) rotates. As the volume of the low-pressure chamber gradually increases due to the eccentric rotation of the piston (60), the refrigerant flowing through the suction pipe (40) is drawn into the low-pressure chamber from the suction port (56). When the low-pressure chamber is blocked from the suction port (56), the blocked space forms a high-pressure chamber.

[0066] As the piston (60) rotates eccentrically, the volume of the high-pressure chamber gradually decreases, and the internal pressure of the high-pressure chamber increases. When the internal pressure of the high-pressure chamber exceeds a predetermined pressure, the reed valve (not shown) opens, and the refrigerant in the high-pressure chamber flows out of the compression mechanism (50) through the discharge passage.

[0067] This high-pressure refrigerant flows upward through the internal space of the casing (11) and passes through the core cut (not shown) of the electric motor (21). The high-pressure refrigerant that has flowed out above the electric motor (21) is sent to the refrigerant circuit from the discharge pipe (16).

[0068] (4) Features (4-1) The outlet pipe (73) is provided with a connection section (80) that connects the outlet pipe (73) to the suction pipe (40). The connection section (80) has a main flow path (81), a plurality of branch flow paths (83, 84), and a branch section (87). The main flow path (81) is into which the refrigerant flowing out from the accumulator (70) flows and extends downward. Each branch flow path (83, 84) has an inlet (85) that communicates with the main flow path (81) and an outlet (86) that communicates with the suction pipe (40). The branch section (87) is formed below the main flow path (81), and the liquid refrigerant that has passed through the main flow path (81) collides with it, dividing the liquid refrigerant into the respective branch flow paths (83, 84).

[0069] As a result, the liquid refrigerant that has passed through the main flow path (81) collides with the branching section (87) and is evenly divided into the respective branching flow paths (83, 84). Consequently, uneven distribution of the liquid refrigerant flowing from the accumulator (70) into each compression section (50a, 50b) can be suppressed.

[0070] (4-2) The inlets (85, 85) of the multiple branch channels (83, 84) are aligned horizontally to each other. This allows the liquid refrigerant that has passed through the main channel (81) to be evenly distributed to each branch channel (83, 84).

[0071] (4-3) Each of the inlets (85, 85) in the multiple branch channels (83, 84) faces upward. This makes it easier for the liquid refrigerant that has passed through the main channel (81) to flow into each branch channel (83, 84).

[0072] (4-4) The inlets (85, 85) of the multiple branch channels (83, 84) are arranged on either side of the axis (C) of the main channel (81). This allows the liquid refrigerant that has passed through the main channel (81) to be evenly distributed to each of the branch channels (83, 84).

[0073] (4-5) The connecting portion (80) is formed integrally with the outlet pipe (73). This reduces the number of components that make up the rotary compressor (10). This reduces the cost of the rotary compressor (10).

[0074] (4-6) The refrigeration system (1) includes a rotary compressor (10) equipped with an outlet pipe (73) having a connection part (80), and a refrigerant circuit (1a) through which the refrigerant compressed by the rotary compressor (10) flows. This provides a rotary compressor (10) that can suppress the uneven distribution of liquid refrigerant flowing from the accumulator (70) to each compression section (50a, 50b), thus providing a refrigeration system that is less prone to failure.

[0075] (5) Variant The above embodiment may also be modified as follows. In the following description, we will primarily explain the differences from the above embodiment.

[0076] (5-1) Variation 1 The connecting portion (80) may be made of a separate component from the outlet pipe (73). In this case, the outlet pipe (73) has only a main body portion (74). The connecting portion (80) is made of, for example, iron. The connecting portion (80) is fixed below the outlet pipe (73) by welding or brazing.

[0077] In this modified example, by constructing the connecting part (80) from a separate component from the outlet pipe (73), the connecting part (80) and the outlet pipe (73) can be made of different materials. This allows for the use of less expensive materials for both the connecting part (80) and the outlet pipe (73), thereby reducing the cost of the rotary compressor (10).

[0078] (5-2) Modification 2 As shown in Figure 5, each branch channel (83, 84) in the connection section (80) may extend horizontally. Specifically, the refrigerant channel in the connection section (80) is formed in a roughly inverted T-shape. The configuration of the main channel (81) is the same as in the above embodiment. In this modified example, each branch channel (83, 84) extends straight horizontally inside the connection section (80). The inlets (85, 85) of each branch channel (83, 84) are aligned horizontally. The inlets (85, 85) of each branch channel (83, 84) face sideways. The branch section (87) is formed directly below the main channel (81). The branch section (87) is formed in the center of the bottom of the connection section (80).

[0079] In this modified example as well, since the connecting portion (80) has a branching portion (87), the liquid refrigerant that has passed through the main flow path (81) collides with the branching portion (87) and can be divided into the respective branching flow paths (83, 84) in a generally even manner.

[0080] (6) Reference example The above embodiment may also be considered as a reference example. In the following description, we will primarily explain the differences from the above embodiment.

[0081] As shown in Figure 6, the configuration of the accumulator (70) in this reference example differs from that of the above embodiment. In this reference example, the lower end of the sealed container (71) is located below the lower end of the main body (74) of the outlet pipe (73). In other words, the upper part of the connection (80) is housed inside the sealed container (71).

[0082] The outlet pipe (73) has two liquid return holes (75a, 75b). Each liquid return hole (75a, 75b) is formed on the upper part of the connection portion (80) in the outlet pipe (73). In this reference example, the liquid return holes (75a, 75b) are not formed in the main body portion (74) of the outlet pipe (73). Each liquid return hole (75a, 75b) penetrates the connection portion (80) in the vertical direction. The first liquid return hole (75a) communicates with the first distribution channel (83). The second liquid return hole (75b) communicates with the second distribution channel (84). Liquid refrigerant from the liquid storage portion (71b) flows into the first liquid return hole (75a) and the second liquid return hole (75b).

[0083] In this reference example, by forming a first liquid return hole (75a) and a second liquid return hole (75b) in the connection part (80), the liquid refrigerant in the liquid storage part (71b) flows directly into each distribution channel (83, 84) via the first liquid return hole (75a) and the second liquid return hole (75b). This makes it easier for the liquid refrigerant to flow evenly into each distribution channel (83, 84). As a result, uneven distribution of the liquid refrigerant flowing from the accumulator (70) to each compression part (50a, 50b) can be suppressed.

[0084] Other embodiments The above embodiment may also have the following configuration.

[0085] The compression mechanism (50) of the above embodiment may have two or more compression sections. In this case, the connection section (80) of the outlet pipe (73) has the same number of distribution channels as the compression sections.

[0086] The compression mechanism (50) in the above embodiment may be of the rolling piston type. In this compression mechanism (50), the compression chamber (55) is partitioned by vanes separated from the piston (60) instead of the blades in the embodiment.

[0087] Although embodiments and modifications have been described above, it will be understood that various changes in form and details are possible without departing from the spirit and scope of the claims. Furthermore, elements of the above embodiments, modifications, and other embodiments may be combined or substituted as appropriate.

[0088] The designations "First," "Second," etc., mentioned above are used to distinguish between the terms to which these designations are attached, and do not limit the number or order of those terms. [Industrial applicability]

[0089] As described above, this disclosure is useful for rotary compressors and refrigeration systems. [Explanation of Symbols]

[0090] 1. Refrigeration equipment 1a Refrigerant circuit 10 Rotary Compressor 11 Casing 40 Suction pipe 50a, 50b Compression section 70 Accumulator 73 Outlet pipe 80 Connection part 81 Main channel 83,84 Branch flow path 85 Inlet 86 Outlet 87 Branching point C axis center

Claims

1. Casing (11) and, The casing (11) contains a plurality of compression units (50a, 50b) that compress the refrigerant drawn in from the suction pipe (40), The system includes an accumulator (70) that separates the refrigerant drawn into the compression section (50a, 50b) into gas and liquid, The accumulator (70) has one outlet pipe (73) in which a liquid return hole (75) is formed for returning liquid refrigerant to the casing (11), The outlet pipe (73) is provided with a connecting portion (80) for connecting the outlet pipe (73) to the suction pipe (40). The aforementioned connecting portion (80) is The refrigerant that has flowed out from the accumulator (70) flows into a main flow path (81) that extends downward, Multiple branch channels (83, 84) whose inlet (85) communicates with the main channel (81) and whose outlet (86) communicates with the suction pipe (40), It has a branching section (87) formed below the main flow path (81) where the liquid refrigerant that has passed through the main flow path (81) collides and divides the liquid refrigerant into the respective branching flow paths (83, 84), The central part of the branched portion (87) is formed to be flat or a concave shape that is recessed downwards. Rotary compressor.

2. The inlets (85, 85) of the aforementioned branch channels (83, 84) are aligned horizontally. The rotary compressor according to claim 1.

3. The inlets (85, 85) of the aforementioned branch channels (83, 84) face upward. The rotary compressor according to claim 2.

4. The inlets (85, 85) of the aforementioned branch channels (83, 84) are arranged on either side of the axis (C) of the main channel (81). A rotary compressor according to any one of claims 1 to 3.

5. The connecting portion (80) is formed integrally with the outlet pipe (73). A rotary compressor according to any one of claims 1 to 3.

6. The aforementioned connecting portion (80) is composed of a separate component from the outlet pipe (73). A rotary compressor according to any one of claims 1 to 3.

7. A rotary compressor (10) according to any one of claims 1 to 3, The system includes a refrigerant circuit (1a) through which the refrigerant compressed by the rotary compressor (10) flows. Refrigeration equipment.

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